Ives scoville



I. SCOVILLE.

Machine for Cracking Stone.

Patented Sept. 6, 1859.

STATES PATENT OFFICE.

IVES SCOVILLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO HIMSELF AND W. H. SOOVILLE, OF SAME PLACE.

MACHINE FOR BREAKING STONE FOR. TURNPIKE-ROADS, &C.

Specification of Letters Patent No. 25,371, datedSeptemb'er 6, 1859.

To all whom 'it may concern:

Be it known that I, Ivns ScovILLE, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Machines for Breaking Stone for Ballasting Railroads and Macadamizing Streets and Turnpikes, &c.; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure l, is a vertical section of my inven tion taken in the line 00, a", Fig. 2. Fig. 2, is a horizontal section of ditto, taken in the line y, y, Fig. 1. Fig. 3, is a detached vertical section of a portion of the cylinders taken at the bite. Fig. 4, is a detached perspective of a portion of one cylinder.

Similar letters of reference indicate corresponding parts in the several figures.

The nature of my invention consists in the arrangement of two vertical cylinders dressed substantially as hereinafter described, in combination with a funnel shaped hopper which is dressed with teeth, ribs or projections tending to prevent the rock or stones from rising up in the hopper when being broken by the rollers, and arranged vertically opposite the space between the approximating circumferences of the two cylinders so that it stands off some distance from the cylinders at the top and touches the cylinders at the base and also encircles a portion of each cylinder, substantially as hereinafter described.

The difliculty hitherto attending the cracking or breaking of round stones or other hard substances by means of cylinders has been owing to the inability of the cylinders to catch or seize them, (the stones), in consequence of their rotundity being liable to turn and slip from the bite as the cylinders rotate. This difficulty is fully obviated by my invention.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, A, represent two vertical cylinders which are placed within a suitable frame, B, and side by side so that they will be nearly in contact or at a distance apart to crack or break the stone of the desired size. These cylinders are of cast iron, and cast with a chill. Each cylinder has a series of vertical projections 64, on its periphery and also a series of horizontal or circumferential projections b. The vertical projections a, project out farther from the cylinders than the circumferential projections 12. The vertical projections a, are transversely of ratchettooth form, as shown clearly in Figs. 2 and 4, and those of one cylinder are placed in a reverse position to those of the other, as plainly shown in Fig. 2. The projections Z), are beveled or inclined so as to be transversely of V-forni as shown clearly in Fig. 3.

C, is a hopper which is a cast iron shell also cast with a chill and secured by the side of the cylinders A, A, opposite their bite, as shown clearly in Fig. 2. This hopper may be described as being the longitudinal half of a truncated hollow cone placed in an inverted position and connected at its lower and smaller end with an inclined plane 0, the lower part of which extends within the bite 'of the rollers at their lower ends as shown in Figs. 1 and 2. The interior of the hopper C, is provided with teeth (Z, which extend down to its bottom or to the upper end of the inclined plane 0.

The operation is as follows: The cylinders A, A, are rotated in the direction indicated by the arrows and the stones or other substances in consequence of their gravity and the inclined form of the hopper and plane 0, pass down into the bite or between the two cylinders and are prevented from escaping from the bite of the cylinders in consequence of the hopper and inclined plane 0, the latter being merely a continuation of the hopper. It will be seen there fore that the stones or other substances will be kept in such position as to insure the cylinders grasping them. The teeth (Z, are intended to aid the hopper in performing its function,.said teeth having a tendency to prevent the stones or other substances from turning and also from moving upward. In certain cases however they may be dispensed with and I therefore do not confine myself to their use. The arrangement of the projections a, Z), onthe peripheries of the cylinders A, A, add considerably to the efficiency of the cylinders, said projections cracking or breaking the stones or other articles or substance into lumps of quite uniform size. The cylinders operate with the best effect when What I do claim as my invention and desire to secure by Letters Patent, is'

The arrangement in the manner set forth of the funnel shaped hopper C, constructed substantially as described with the two vertical cylinders A, A, constructed substantially as described, for the purpose of breaking stone for ballasting railroads and macadamizing streets, turnpikes, etc.

IVES SCOVILLE.

Witnesses:

P. W. GATES, I. L. FARGO. 

